What is leak test machine? Leak Test Apparatus is a solid state instrument designed for the leakage testing of food, drug and other industrial chemical products. The instrument is used to test the quality of packing processes in strips, blisters and sachets containing tablets, granulates and liquids. What is the instrument used to test leakage test? The Vacuum Leakage Tester is used to check a non-porous, closed packages for leakage / pinholes / tunnel defects. – Solid Filled / Air Filled packages are tested while submerged in water. What is the method of leak testing? The two most common methods include pressure decay testing and rate of rise testing. In pressure decay testing a known pressure is applied to a component, and pressure is monitored over time to determine pressure decay. The pressure as a function of time can be used to determine the leak rate.